Franco74

Hi Guys,
I have a GB270 running a VF48 turbo and supporting mods. Had a huge plume of smoke out exhaust and lost boost during some spirited driving. I nursed the car home (luckily only about 1mile from house). Every time the car got to around 2500rpm the CEL light was flashing, I presume this is something to do with it trying to boost.
Parked the car in my garage and next day there was a puddle of oil under car. Oil was coming from turbo band so decided it must be oil seals and I'd put the TD04 back on it.
After putting the TD04 back on, it still has flashing CEL around 2500rpm, which stops flashing but remains on when the revs drop. I have an OBDII reader but it won't tell me what the code is, it just says NA but does reset, only to return at 2500rpm.
Car is still smokey out exhaust but this could still be oil from earlier as it hasn't been out garage since turbo swap due to beign SORNED at the moment.
Anyone got any ideas?